//
//  ViewController.m
//  CoreData082586
//
//  Created by dllo on 15/11/20.
//  Copyright © 2015年 lyl. All rights reserved.
//

#import "ViewController.h"
#import "CoreDataManager.h"
#import "Student.h"
@interface ViewController ()

@property (nonatomic, strong) CoreDataManager *manager;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.manager = [CoreDataManager defaults];
    NSLog(@"%@",[self.manager applicationDocumentsDirectory]);
}
- (IBAction)addButton:(id)sender {
    // 实体描述类
    // 参数1.描述的实体  2.数据管理器
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:self.manager.managedObjectContext];
    
    
    // 创建实体
    // 参数1. 实体描述  2.数据管理器
    Student *stu = [[Student alloc] initWithEntity:entity insertIntoManagedObjectContext:self.manager.managedObjectContext];
    
    stu.name = @"遇见";
    stu.age = @100;
    stu.sex = @"男";
    stu.hobby = @"女";
    stu.number = @666;
    [self.manager saveContext];
 
}

// 删除
- (IBAction)delete:(id)sender {
    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
    
    NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@", @"sex", @"%@"],@"男"];
    request.predicate = predicate;
    
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"sex" ascending:YES];
    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    
    NSError *error;
    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
    
    for (Student *stu in array) {
        [self.manager.managedObjectContext deleteObject:stu];
    }
    [self.manager saveContext];
    
    
}

// 查找
- (IBAction)select:(id)sender {
    
    // 创建查找请求,相当于数据库查询语句
    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
    
    // 添加一个约束 谓词
    NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@" , @"name", @"%@"],@"遇见"];
    request.predicate = predicate;
    
    //通过某个 key 给数组排序
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    
    NSError *error;
    
    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
    NSLog(@"%ld",array.count);
}
// 修改                                                                                                
- (IBAction)update:(id)sender {
    
    // 创建查找请求,相当于数据库查询语句
    NSFetchRequest *request = [[NSFetchRequest alloc] initWithEntityName:@"Student"];
    
    // 添加一个约束 谓词
    NSPredicate *predicate = [NSPredicate predicateWithFormat:[NSString stringWithFormat:@"%@ == %@" , @"name", @"%@"],@"遇见"];
    request.predicate = predicate;
    
    //通过某个 key 给数组排序
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
    [request setSortDescriptors:[NSArray arrayWithObjects:sortDescriptor, nil]];
    
    NSError *error;
    NSArray *array = [self.manager.managedObjectContext executeFetchRequest:request error:&error];
    Student *stu = [array lastObject];
    stu.sex = @"rtyuiop";
    [self.manager saveContext];
    
    
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end
